What is an Octet?

What is an Octet?

• A. 8-binary bits that represent one field of an IP address, separated by a "."
• B. A unit of measurement in networking equal to 2^8 bytes
• C. A 16-bit portion of an IP address
• D. A placeholder for dynamic IP addresses

Answer: (A)

An octet is eight bits—the basic building block used to express an IPv4 address. An IPv4 address is 32 bits long and is divided into four octets, each representing one 8-bit field. When we write the address, each octet is shown as a decimal value from 0 to 255 and the four values are separated by dots, for example 192.168.0.1. Eight bits give 256 possible values, which matches the range 0 through 255 for each octet. The other statements mix up the concept: one implies a unit of 2^8 bytes (which would be 256 bytes, not 8 bits), another refers to a 16-bit portion, and another suggests a placeholder for dynamic IPs—none of these describe an octet correctly.

An octet is eight bits—the basic building block used to express an IPv4 address. An IPv4 address is 32 bits long and is divided into four octets, each representing one 8-bit field. When we write the address, each octet is shown as a decimal value from 0 to 255 and the four values are separated by dots, for example 192.168.0.1. Eight bits give 256 possible values, which matches the range 0 through 255 for each octet. The other statements mix up the concept: one implies a unit of 2^8 bytes (which would be 256 bytes, not 8 bits), another refers to a 16-bit portion, and another suggests a placeholder for dynamic IPs—none of these describe an octet correctly.